6-sulfonyl chromans
CA 1325216 C · Owner: Wendstone Chemicals Plc · Inventors: Ramage, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A class of novel chemical compounds comprising derivatives of 2,2,5,7,8-pentamethylchroman-6-sulphonyl and having the structural formula, wherein X is selected from halogen and other groups having acidic functionality, and preferably the X-group being chlorine. The said compounds are made by the sulphonation of 2,2,5,7,8-pentamethylchroman, preferably using chlorosulphonic acid. The primary utility of the compounds of the present invention is in the protection of functional groups in organic synthesis and more particularly in the protection of basic functional amino groups such as, amidines and guanidines. The invention also provides a method of making the protecting group and a protected …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.